Multiple-fuel carbureter.



MULTIPLE FUEL CARBURETER. APPLICATIQN FILED MAR. H. 191s.. nENEwED APR.la, 1911.

Patented July 31, 1917.

2 SHEETS-SHEET1.

ATTORN E Y lNvENoR WITNESSES L. A. ,`E. T. & E. L. STRAUBEL. MULTIPLEFUEL CARBURETEH. APPLICATION FILED IIAII. II. IsIs. IIEIIEwIzD APR.13.19I7.

152915,396. Patented July 31, 1917.

III I 2g? I o lA5" /5 I` wITNEssEs MNVENTOR W ATTORNEY' nected theexhaust pipe 9.

LOUIS A. STRAUBEL, ERNEST T. STRAUBEL, AND EDWARD L. STRAUIBEL, OF GREENBAY, WISCONSIN.

MULTIPLE-FUEL CABBURETER.

Specicatin of Letters Patent.

Patented July 31, 1917.

Application led March 11, 1913, Serial No. 753,647. Renewed April 13,1917'. Serial No. 161,901.

To all 'whom t may concern.'

Be it known that we, LOUIS A. STRAUBEL, ERNEST T. STRAUBEL, and EDWARDL.

STRAUBEL, citizens of the United States, and.

residing at Green Bay, Wisconsin, have invented a new and usefulimprovement in Multiple-Fuel Carbureters, of which the following is afull and accurate description.

Our invention relates to that class of internal combustion engines inwhich provision is made for burning either gasolene or a heavier oil askerosene, distillates or alcohol, or any combination thereof. The objectof the invention is to produce an engine in which said fuels may beburned interchangeably, that change may be .made from one fuel to theother by the simple adjustment of a valve, that the fuel may be aeratedor mixed with a quantity of air and then heated to a high temperature,and that cool air may be mixed with the heated vapor in a desiredproportion before entering the crank case or combustion chamber of theengine. n

We attain these objects by means of the mechanism hereinafter described,reference being had to the accompanying drawings which are made a partthereof, and in which Figure 1 represents a side sectional view througha two cycle engine and vapor heating passage, mixing valve, etc. Fig. 2a front sectional view through the vapor heating passage and mixingvalve, Figs. 3, 4 and 5 are sectional views through the mixing valve,Fig. 6 is a top plan of the mixing valve, Fig. 7 a front sectional viewthrough the carbureter valves, Fig. 8 a side sectional view through thecarbureter, Fig. 9 a horizontal sectional view or plan of the carbuieterand vapor heater, and Fig. 10 a perspective showing the carbureter andvapor heater and the relative position` of the parts. Similar numbersrefer to similar parts in the several views.

To illustrate the invention a .two cycle type of engine has beenemployed though the apparatus on which priority of claims is based maybe used on a four cycle engine as well, 1 is a cylinder, 2 the crankcase, 3 the piston, 4 the connecting rod, 5 the inlet port, 6 the gaspassage or by pass, and 7 the exhaust port of a two cycle internalexplosive engine.

8 is an exhaust passage to which is con- Lying within this exhaustpassage S is a return tube 10 through which the vaporized fuel isheated. 11 is an air port and 12 a mixing valve, the purpose of which isto Amix air with the heated vapor before it passes into the mixingchamber 13 and the crank case 2. 14 is a carbureter attached to thelower end of the exhaust passage in such a manner that it connectsdirectly into one end of the return tube 10. The other end of returntube 10 opens into the mixing valve 12.

It vcan be readily seen that other forms of vapor heaters may be used,as for instance a straight tube or spiral coil carried through theexhaust passage which, if of sufficient length, will heat the vapor aswell, and the only purpose of using the return tube shown is to obtainsufficient length of tube to properly heat the vapor.

The carbureter 14 is shown in detail in Figs. 1, 7, 8, and 9 and is ofthe float type and is double, i. c. there are two compartments, onepreferably for gasolene, the other for kerosene, distillate or otherheavier fuel, the two portions being identical except that it may bedesired to use larger passages for' the heavier oil, and a descriptionof one will i fit both. 15 is a supply pipe which feeds the floatchamber 16. 17 is a cork float with a stem 18 passing through it, theupper end 19 passing through the cover 20 of the float chamber andserving as an indicator, the lower end terminating in a valve 21 whichshuts off the, supply of fuel when the float chamber is suflicientlyfilled and opens when thefioat drops.

22 is a passage from the ioat chamber to the fuel duct 23, 24 is an airport through which air is drawn by the vacuum produced in the crank case,or combustion chamber of the engine. The air being drawn through port24 Vpasses over the fuel kduct 23 `at a high velocity and aerates ormixes the fuel by contact and absorption. This forms a rich vaporousmixture which then passes into the valve 25 and from thence on into theheating tube 10.

Valve 25 is of the plug type but is provided with two inlets 26 and 27and so arranged that when the opening is full from one side the otherside is completely closed, the object of this arrangement being so thatfuel may be taken from one side or the other as desired. 28 and 29 areneedle valves with thumb heads 8O and 3l by which the supply of fuel maybe adjusted or positively shut oli' i'roni either side or both. Afterbeing aci-ated the rich mixture is then drawn through the outlet 32 ofthe carbureter into the return tube l() through which it passes on tothe mixing valve l2. ln its passage through the return tube l0 the vaporis heated to a high temperature by the exhaust from the engineinipinging against and passing around the tube on its way to the exhaustpipe.

Mixing valve l2 is of a rotary, cylindrical type with three ports. 33 isthe gas inlet port and lies directly below the outlet or return tube l0and is in the forni ot an oblong slot cut peripherally in the body ofthe valve. 3d is the air inlet port and is in the forni of alongitudinal slot, and 35 is the outlet port for air and gas and 'forthe greater' portion of its length isV also in the forni of alongitudinal slot which joins the inlet port and becomes an extension ofsaine as shown in Fig. 6.

rlhe valve is constructed with ports of a proportionate size whichrepeated trial and experiment has demonstrated to be correct for themost etiicient mixture of air and gas, and it is so arranged that whenthe valve is turned in the vertical position shown in Fig. 3 and asindicated by dotted line A, gas port 33, air port Se and outlet port 35are all open full. When the valve isturned toward the left as shown inllig. et an'd indicated by dotted line B the air port 34ris entirelyclosed, gas port 33 still has a full opening owing to its slotted torni,and outlet 35 is partially open. lNhen in this position it will be notedthat a rich mixture ot fuel and air is drawn through the fuel canal intothe engine. lt is thus manifest that any position of the valve betweenthe positions n and B allows a greater or less quantity of air to mixwith the rich gas according to the angle of inclination from A to B.This ifeature is of use in starting, as a richer mixture is neededespecially when the engine is cold.

l/Vhen the valve is turned toward the right as shown on Fig. 5 andindicated by the dotted line C both gas port 33 and air port Si areclosed, the outlet 35 from the'valve being partly open. rlhis stops theengine by shuttingoil? the fuel supply. lt is thus manifest that anyintermediate position of the valve betweeny the positions B and C willaiiect the speed of the engine owing to the decreased fuel and airsupply, and this :tea-

ture is used to regulate the speed, the valve.

being operatedby a hand lever or governor according to the type ofeigine. lt will also be noted that the turning of the valve to the rightcuts ott the supply of both gas and air in the saine proportion inalringthe engine practically tool prooi. The subsequent action of the gases,explosion, etc., needs only a brief explanationj as the action. in theconn nection shown is that of an ordinary two cycle engine. The upwardmotion of the piston 3 produces a partial vacuum in the crank case 2 andwhen the inlet port 5 is uncovered the gas and air mixture rushes in.W'hen the piston descends the mixture is compressed in the crank case.As soon as the exhaust port i' is opened the burnedY gases exhaust intothe heating passage and an instant later the mixture oil air and gasrushes into the explosion chaniber to be conipressed and exploded.

in a four cycle engine the niiXtu-re of heated gas and air is drawndirectly into the combustion chaniber of the engine atV will thenautomatically regulate the speedV by varying the quantity of air and gasadinitted to the crank case or combustion chaniber. lt is well knownthat a gasolene engine of the ordinary type will run for a tinie onAkerosene or distillates after the engine is heated up, but thecombustion Ychanif ber is very apt to beconie carbonized and dirty owingto the imperfect combustion. life have found that a gas produced fromkerosene or other siniilar oils lacks stability when iornied in theusual way of forming gasolene gas, and to be perfectly volatilized inustbe heated to a high temperature. No have found that it is impractical torniX the adequate amount of air and fuel ior per- ;tect combustion, thenheat it and adniit the heated mixture to the engine, as in the caseV oithe two cycle engine where the heated gas is admitted to the crank casethe revolving parts beconie overheated and proper lubrication isprevented, and in both the two cycle and four cycle engines, heating theniiXture greatly reduces the volumetric eflicienoy of the gas. `We havefound also that the heated gas niay be mixed with air at out doorternperature with little loss frein condensation and when so used thecharge becomes niuch more effective when compressed and eX- ploded.

What we claini and desire to protect by Letters Patent is n multiplefuel carburetor having a body provided ith a rearwardly projecting steinand with a central outlet opening extending therethrough and throughsaid stein, said body also having separate oil chambers upon oppositesides of said outlet opening, said outlet opening having itscountcrbore. at its forward end, said body also having ports projectinglaterally in opposite directions irorn the outlet opening forwardly ofthe oil chanibeirsT and vertical ports coniniu nicating with saidlateral ports and open to of said vertical portions of said oil ports,the atmosphere, a hollow plug Valve rotatato control communicationbetween the latter ble in said eountei'boi'e of the outlet opening andthe said lateral ports. and hsvin openings in its wall for registry 5with the stid lateral ports, said body also Y havin@ oil poi'ts leadingforwardly from the said oil chambers and parovided with upright EDVARDL' STRAUBEL' portions extending into the said lateral' Witnesses: ports,and regulating valves threaded into P. T. BENTON, l0 the body andmovable into the upper ends O. H. FRmDEL.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

